My reference to kryponite was a glib comment Mo, not one to take seriously. Kryptonite, to my knowledge, probably doesn't even exist. It was the element that gave Superman his powers. I was suggesting that unless it's as strong as 'the man of steel' himself it would be worthless.
But you are absolutely correct, my experience of recovery is pretty basic so perhaps I shouldn't be commenting on here in the first place (although in my defence I did say it was unfit for purpose which is in line with everybody else's opinion).